MTN shocking service

Dear MTN I do not know what the hell is going on with you. I do an upgrade, you decide to simm swop without discussing with me. New simm at home, my phone gets cut, mails back and forth and cannot resolve, take simm out, send 10 didgets, sorry not associated with you number, send a photo, give it 24 hours, no sorry go to an MTN store. Get there pay R150 for something I did not know or ask for. Since upgrade my bill went from a general R2300-R4000-R9000-now sitting on R 19 600.00. What the hell is going on. Sort this out immediately. Becoming a big headache provider and bad experience. Definitely need to start to explore other options with my 5 lines